Liquid fuel burners



Feb 16, 1965 BUNJl AlzAwA ETAL LIQUID FUEL BuRNERs Filed April 19, 196sw J9 19a J8 INVENTOR. Bunj Aizawa QP NOBUHIKO KATAGIRI United StatesPatent O 3,169,519 LIQUID FUEL BURNERS Bunji Aizarva and NotauhikoKatagiri, Kaum-shi, Japan, assignors to Toshiba Denki Kigu KabushilriKalsha,

Tokyo-t0, Japan, a joint-stock company of Japan Filed Apr. 19, 1963,Ser. No. 274,073 Chinas priority, application Japan, Dec. 17, 1962,37/55,3St; Jan. 19, 1963, 38/ 1,518 Claims. (Cl. 126-96) This inventionrelates to liquid fuel burners and more particularly to an improvedliquid fuel burner provided with a flame cylinder disposed above a wick,wherein a flame extinguishing plate is mounted in the upper portion ofthe flame cylinder and is adapted to direct toward the ame burning onsaid wick, when the entire burner assembly is accidentally tilted oroverturned, a blast of wind which reverses its direction.

With the recent development of various types of kerosene stovesincluding the so-called Wick lifting and lowering type wherein the wickisV immersed in a body of kerosene to feed it to the combustion sectionby utilizing the capillary action of the wick and the so-called liquidhead type wherein the fuel is fed to the wick by gravity from a fuelreservoir positioned above the wick, it has been desired to provide aneffective ame extinguishing device which can promptly extinguish thewick llame so as to prevent dangerous lires caused by the fuel floodinginto the body ofthe burneror scattering on the floor to come into directcontact with the llame on the wick or the red hot llame cylinder whenthe liquid fuel burner is accidentally tilted or overturned on the oor.

Heretofore a safety device for liquid fuel burners wherein for example,a` cover is caused to beat and extinguish the ame directly has beenproposed, but in this arrangement, if a small gap remains between thekcoverl and the Wick, or if the flame extinguishing cover is overheatedafter long operation, the fuel may be reignited after it has once beenextinguished.

It is therefore the principal object of this invention to provide animproved flame extinguishing means for such liquid fuel burners.

In one embodiment of this invention, a llame extinguishing plate ismounted in the flame cylinder which is placed over the wick of a liquidfuel burner, said flame extinguishing plate being so constructed that,when the liquid fuel burner is tilted, it produces a blast of air thedirection of which is alternately reversed by oscillation of the flameextinguishing plate.

In accordance with the preferred embodiment of this invention, saidllame extinguishing plate is swung by means of a spring in the directionto direct a blast of air toward the flame when a catch associatedtherewith is released by a latching member which, in the normal state,holds said spring in the energized or charged state. To get moreeffective extinguishment of the flame, it is desirable to use a plate ofresilient member or a rigid plate supported by a spring member. In thismanner a strong downward and reverse blast of air can be generated. Thesaid latching member is released by actuation through a push rodconnected to a connecting lever 'frranged to be rotated when the liquidfuel burner is tilted or overturned. Thus, the llame extinguishing plateconstructed in accordance with this invention operates Very quickly topositively extinguish the wick llame when the burner is tilted or upset.

In addition there is no possibility of reignition after extinguishingsince the llame extinguishing plate itself is not brought into contactwith the combustion section of the burner even when the temperature ofthe plate "lee The features of the invention which are believed to benovel are set forth with particularity in the appended claims. Theinvention itself, however, as to its organization together with furtherobjects and advantages thereof, may best be understood by reference tothe following description taken in connection with the accompanyingdrawing, in which FIG. 1 shows a vertical section of oneembodiment ofthis invention in the normal condition;

FIG. 2 shows the same vertical section of the liquid fuel burner shownin FIG. 1 when it is tilted; and

FIG. 3 is an enlarged perspective view of certain essential parts of thefuel burner shown in FIGS. 1 and 2.

Referring now to the accompanying drawing illustrating the invention asapplied to .a wick lifting Vtype single cylinder kerosene stove, thereis provided on the bottom surface of a liquid fuel reservoir 2 anupwardly extending cylindrical wick guide 1 surrounded by a wick 3.Around the wick 3 is provided a burner basket 5 having a cylindricalmetal wire net 4. A burner cap 6 is placed over the burner basket 5,which supports a flame cylinder 7. A horizontal shaft 8 is rotatablyjournalled in a depression provided in the upper portion of the sidewall of the llame cylinder 7, and a thin elliptic flame extinguishingplate 9 is mounted on the shaft S. The plate 9 is either resilient asillustrated in FIGS. 1 and 2 or is mounted on the shaft S by means of aspring 21 as illustrated in FIG. 3. The shaft 8 is normally biased inthe counterclockwise direction, as viewed in FIG. 3

by a coil spring 10. Secured to the shaft 8 is a cam shaped catch member11 with its ,projection normally engaging one end of a latching member12 pivoted on a pivot 13 so as to normally hold the coil spring 10 inits energized or charged State. Opposite to the flat portion 14 at theother end of the latching member 12 is disposed the upper end 16 of apush rod 15 which is arranged to be moved in the vertical direction inparallel with the side surface of the flame cylinder 7. The lower end ofthe push rod 15 is connected to a connecting lever 17 which is disposedhorizontally below the bottom surface of the fuel reservoir 2. Theconnecting lever 17 is pivoted on a pin 17a substantially at its middleportion and is biased in the counterclockwise direction around the pin17a by means of a spring 18 having its one end connected to the pin 17aand the other end to the connecting lever 17. The opposite end of theconnecting lever 17 is bent at right angle .to extend toward the oorsurface through a small opening 19a provided through a platform 19.While the llame extinguishing plate 9 is shown as being mounted on theshaft 8 through a spring plate 21, it may be directly mounted on theshaft if so desired. A knob 22 is secured on one end of the shaft 8 formanual rotation thereof.

The operation of the flame extinguishing Vdevice of this invention willbe described hereunder by referring to FIGS. 1 and 2. When the liquidfuel burner is in the normal vertical position as shown in FIG. 1, thelower end of the bent portion of the connecting lever 17 directly restson the oor to urge the rod in the clockwise direction against the actionof the spring 18, thereby to pull down-the push rod 15 and to hold thepush member 16 at its upper end separate from the cooperation portion 14of the latching member 12. Therefore, the other end 12a of the latchingmember 12 continues to engage the projection of the catch member 8 tohold the llame extinguishing plate 9 in its inoperative position A, asshown in FIG. 1, against the force of the spring 10 thus permittingnormal burning condition for the burner to continue. However, when theburner is accidentally tilted or overturned, as shown in FIG. 2, thespring 18 causes the connecting lever 17 to rotate in thecounterclockwise direction around the pin 17a so as to raise the pushrod 15 to disengage the latching member 12 from the catch member 11.Thereupon, the ame extinguishing plate 9 is rotated to the position C,FIG. 2, by the force stored in the spring 10, around the shaft 8. Thenthe plate springs back to the position B and then again is brought tothe position C by the resiliency of the llame extinguishing plate 9itself. air which automatically reverses its direction is produced.Thus, more particularly, as the flame extinguishing plate 9 is rotatedfrom the position A to the position Ca downward blast of air is directedto the flame burning on the top periphery of the wick 3 while a largequantity of cool air is caused to flow across said top periphery throughthe cylindrical metal wire net 4 by quick swinging motion of plate 9from the position C to the position B. This quick swinging motion ofplate 9 is caused by the resilient properties of the construction of theiame extinguishing plate, and a further downward blast is again suppliedto the ilame when the plate returns to the position C thus assuringquick and positive ame extinguishment. In order to reset the plate 9 tothe original state, the shaft 8 is rotated bymanipulating the knob 22until the catch member 11 is arrested by the latching member 12 as shownin FIG. 3. Thus, the spring 10 is recharged and the apparatus isrestored to the condition of FIG. 1.

In accordance with the provisions of the patent statutes, we haveexplained the principle and operation of this invention and haveillustrated and described what we consider to represent the bestembodiment thereof. However, we desire to have it understood that Withinthe scope of the appended claims, the invention may be practicedotherwise than as specifically illustrated and described.

What is claimed is:

1. A liquid fuel burner comprising a wick and a flame cylinder disposedabove said wick, which comprises a flame extinguishing plate which ispivotally mounted in the upper portion of said ame cylinder, springmeans adapted to force said extinguishing plate to quicklyswing aboutits pivot to direct a blast of wind toward the ame In this manner, ablast of` burning on said wick, a latching-mechanism which normallyholds said spring means in the energized condition, a push rodassociated with said latching mechanism so as to release said mechanismwith said rod is pushed, and a connecting lever means which is rotatedwhen said liquid fuel burner is tilted and is connected to said push rodso as to push said rod to release said latching mechanism when saidlever means is rotated.

2. A liquid fuel burner according to claim l, in which the arneextinguishing plate is made of a resilient member.

3. A liquid fuel burner according to claim 1, in which the ameextinguishing plate consists of a rigid plate member and a spring membersupporting said plate member.

4. A liquid fuel burner according to claim 1, in which the ilameextinguishing plate is secured to a shaft which is journalled on theside of the flame cylinder and the spring means is of coil spring formadapted to cause said shaft to rotate.

5. A liquid fuel burner according to claim l, in which the push rod isarranged to move in the vertical direction in parallel with the backsurface of said llame cylinder, the lower end of said push rod isconnected to one end of the connecting lever disposed horizontallybeneath the bottom of a fuel reservoir, said connecting lever beingpivoted on a pin at its middle portion and biased by means of a springto rotate'to lower said push rod, and the other endof said connectinglever being bent downwardly to directly contact the oor surface.

References Cited by the Examiner UNITED STATES PATENTS 252,098 1/82Grannis 67-78 FOREIGN PATENTS 64,258 2/ 92 Germany. 80,439 7/ 94Germany.

7,540 3 13 Great Britain.

JAMES W. WESTHAVER, Primary Examiner.

FREDERICK KETTERER, Examiner.

1. A LIQUID FUEL BURNER COMPRISING A WICK AND A FLAME CYLINDER DISPOSEDABOVE SAID WICK, WHICH COMPRISES A FLAME EXTINGUISHING PLATE WHICH ISPIVOTALLY MOUNTED IN THE UPPER PORTION OF SAID FLAME CYLINDER, SPRINGMEANS ADAPTED TO FORCE SAID EXTINGUISHING PLATE TO QUICKLY SWING ABOUTITS PIVOT TO DIRECT A BLAST OF WIND TOWARD THE FLAME BURNING ON SAIDWICK, A LATCHING MECHANISM WHICH NORMALLY HOLDS SAID SPRING MEANS IN THEENERGIZED CONDITION, A PUSH ROD ASSOCIATED WITH SAID LATCHING MECHANISMSO AS TO RELEASE SAID MECHANISM WITH SAID ROD IS PUSHED, AND ACONNECTING LEVER MEANS WHICH IS ROTATED WHEN SAID LIQUID FUEL BURNER ISTILTED AND IS CONNECTED TO SAID PUSH ROD SO AS TO PUSH SAID ROD TORELEASE SAID LATCHING MECHANISM WHEN SAID LEVER MEANS IS ROTATED.